Portable electric exhausting fan



y '7 1947- A. A. VON SNEIDERN 2,

PORTABLE ELECTRI C EXHAUS TING-FAN Filed Nov. 20, 1945 Patented May 27, 1947 PORTABLE ELECTRIC EXHAUSTING FAN Arne Alvar von Sneidern, Landskrona, Sweden, assignor, by mesne assignments, to Aktiebolaget Thulinverken, Landskrona, Sweden, a corporation of Sweden Application November 20, 1945, Serial No. 629,901 In Sweden November 13, 1944 3 Claims. 1

This invention relates to portable electric exhausting-fans and has for its primary object to provide a convenient portable electric exhausting-fan for withdrawing hot gases from the cooling compartments in the rear of the firing zone in a continuous kiln for burning bricks, and for spreading these gases in the air in a drying house for green bricks above the kiln to warm the air in this drying house and thus promote the drying of the green bricks therein. Another object of the invention is to provide a portable electric exhausting-fan which comprises a fan-wheel secured to the shaft of an electric motor above and adjacent to the fan-wheel, and which may conveniently be placed above a fire hole in the roof of the continuous kiln for withdrawing the hot gases from the cooling compartments in the rear of the firing zone in the kiln through the firing hole, and for spreading these hot gases in the air in the drying house for the green bricks above the kiln.

For these and such further objects as may appear from the following description of a preferred embodiment of the invention illustrated in the accompanying drawings, the invention consists in the construction and combination of parts hereinafter described and finally defined in the appendant claims.

In the drawings:

Fig. 1 is an elevation of the portable electric exhausting-fan.

Fig. 2 is an axial section on a larger scale of the fan-wheel and illustrates its construction and mounting on the shaft of the electric motor.

Figs. 3 and 4 are a plan view and a, section on the line IV-IV in Fig. 3, respectively, of a detail of the fan-wheel.

Referring to the drawings, I indicates a cylindrical casing with vertical axis, which in its lower end is provided with a, central inlet opening la. The lower portion of the mantle of the casing I is of sheet metal, whereas the upper portion of said mantl is in the form of a net-work or grating 2. The casing I is reinforced by means of a ring 3 at its upper end, and by means of vertical ribs 4, the lower ends of which are bent outwardly to form feet. Brackets 5 secured on the ring 3 carry an electric motor 8 whose shaft is vertical and has a projecting lower end portion 1 on which is secured a fan-wheel working within the casing I. This fan-wheel comprises a full sheet metal disk 8 having a downwardly projecting cup-shaped central portion 9 and blades I0 riveted or otherwise secured to the under side of the disk 8, 9, and is secured to the motor shaft 'I by means of a second circular sheet metal disk II (shown in Figs. 3 and 4) which is arranged at a certain distance above the disk 8 and preferably is of less diameter than the latter. The disk I I has a central opening, and secured in this opening, for instance by means of welding, is a hub I2 (Fig. 2) threaded onto the motor shaft 1 and secured thereto by means of a set screw I 3 or in any other suitable manner. The circular disk II is provided at its outer periphery with cutout and downwardly bent portions or flaps I4, some of which are provided at their lower ends with flanges I5 to which the lower circular disk 8 is riveted or otherwise secured. At a suitable distance from the outer periphery, the disk II is provided with air inlets I6 leading to the space between the two disks 8 and II, and, preferably, these air inlets are formed by cutting out flaps I1 and bending these flaps upwardly to a suitably inclined position, so that the flaps II, when the motor 6 is running, will catch the air and force it through the inlets I6 into the space between the two disks II and 8, in which space the flaps I4 act as fan blades for producing a flow of cooling air outwardly through the space between the two disks 8 and I I.

As illustrated in Fig. 1 the motor 6 is provided with a suitable handle I8 by means of which the whole assembly may be easily lifted, transported and set down as desired.

When the portable electric exhausting-fan is to be used for withdrawing hot gases from the cooling compartments in the rear of th firing zone in a continuous kiln for burning bricks or the like, it is placed over a firing hole in the roof of the kiln, and when the motor 6 is running the blades I 0 of the fan wheel will draw the hot gases up through the firing hole and spread them outwardly through the grating 2 into the air in the drying house for green bricks above the kiln. The disk 8, 9 will prevent the hot gases from coming into contact with the motor and especially with its shaft and shaft bearings, and the conduction of heat to the motor shaft and shaft bearings from the parts 8, 9 and Ill of the fan wheel heated by the hot gases will be reduced to a minimum by the absence of any other heat conducting connection between said parts and the motor shaft than that constituted by the flaps l4 and the disk II, which are cooled by the cooling air flowing through the space between the two disks I I and 8. The cooling air leaving the said space will be mixed with the hot gases leaving the fan through the grating 2 and thus aid in the spreading of the hot gases in the air in the drying house.

The portable exhausting-fan may easily be moved from one firing hole to another in the roof of the kiln as the firing zone advances.

As will be seen from the drawings; the whole assembly, comprising the fan proper and the motor, i of relatively small dimensions and thus relatively light and compact as a result of the motor being arranged so closeto the fanrwheel through which the hot gases pass, which arrangement is made possible by theabsenceeorany, other heat conducting connection between said fan wheel and the motor shaft thanthat constituted casing and exhausting them radially through the outletat the upper part of the-casing; said fan wheel comprising a full" circular disk, fanblades mounted on the under side of said disk, and a seconddisk; located ata distance above'said first disk and having a central hub secured on the motor shaft, and means connecting said first disk to said second disk at a considerable distance from the motor shaft, said first disk being out of contact with the motor shaft and the hub secured thereon, and said second disk inlets for cooling. air leading to thespace formed between the two disks.

2. In a portable electric exhausting-fan as claimed in claim 1, the additional feature that th'e'means connecting said first disk to said seconddisk comprises flaps bent out from said secomtdisk'and'racting as fan blades for producing a fiow'of'coolingair through the space between the two'di'sks.

3-. In aportable electric exhausting-fan as claimedrin claim 1, the additional feature that the lower portion of the mantle of the cylindrical casing is of full sheet metal, whereas the upper portion of said mantle min the form of a gratin forming said outlet.

ARNE ALVAR' von REFERENCES CITED;

The following references are of record in the.

file" of this patent:

UNITED STATES PATENTS Number Name Date 11342592 Orr June-'8; 1920 2,082,955 Hagen June-8;,1'937 

